Cylance Smart AV performs a single initial scan of the drive when the Agent is first installed. After the initial scan, the Agent will only scan new incoming Portable Executables and modified files. This is to prevent high usage of system resources unlike traditional antivirus. The Agent will not perform another full scan on your drive unless manually enabled.
If you would like to perform a manual scan, please refer to How to - Cylance Agent - Advanced UI, and search for the Run a Detection setting.